One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10)(11,15)(12,16)(13,17)(14,18)(19,23)(20,21)(22,24)(26,32)(28,36)(29,37)(33,40) involution — undirected(3,7)(6,8)(9,11,14,17)(10,15,18,13)(12,20,22,19)(16,21,24,23)(25,26)(27,33)(28,34)(29,38)(30,36)(31,32)(35,37)(39,40)(1,2)(3,6)(4,5)(7,8)(9,11)(10,13)(12,19)(14,17)(15,18)(16,21)(20,22)(23,24)(25,27,31,39)(26,33,32,40)(28,37,36,29)(30,38,34,35)(1,3)(2,6)(4,7)(5,8)(9,11)(10,15)(12,19)(13,18)(14,17)(16,23)(20,22)(21,24)(25,28)(26,34)(27,37)(29,39)(30,32)(31,36)(33,35)(38,40) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,12)(10,16)(11,19)(13,21)(14,22)(15,23)(17,20)(18,24)(25,29,31,37)(26,35,32,38)(27,28,39,36)(30,40,34,33)(9,13,14,15)(10,17,18,11)(12,21,22,23)(16,20,24,19)(25,30,31,34)(26,36,32,28)(27,38,39,35)(29,40,37,33)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.